Like said above there are way to many difference to list but IMO they are the 2 best roms out. I have been using koush Rom for the last 3 weeks and its my favorite but before that I used ultimate Droid which I thought was very good too. You would-be happy with either one, why don't you try both and decide which one fits you better.
I'm trying them out, but besides the launcher differences I can't see anything else except very minor asthetic changes (i.e. black skin on ultimate droid, the VZW label is now "Ultimate Droid", etc..). I can't see anything substantial really.
Okay here we go.
Koushes rom has
*360 rotate (you can rotate the screen upside down if you want)
*Shows the battery percentage on the battery
*Has a reboot option in the power off menu
*You can skip songs by using the volume button when the screen is locked
*Browser has user agent, displays moving avatars and can be used in full screen
*MMS app has themes (dark or light), you can also change the led color
*Has a built in terminal emulator
*Has the latest app updates released from google's source
*Has apps2sd
*Has option to move apps from system to sd or sd to system
*Has the nexus dock app *NOT SURE ABOUT ULTIMATE NOT HAVING THIS ONE.
*Has the option to turn the phone to silent or vibrate by using the right pull tab on the lock screen
*Has a moded music widget that lets you pause, go back or forward and displays cover art
*Has a fully fixed corpcal app
Ultimate Droid is missing all of these features
Just to name a few.
oh ok, right now im on droidmod. so i can just download this from the market and try it out or should i go back to 2.0.1 then reroot and do this?
Droid mod is 2.0.1.
Download the Rom Manager app
Install Cyanogen 5.0.5.7
Wipe data and cache.
The app does all the work. Kind of like DM.
Does the app allow or me or anything for that matter to unroot my n1?